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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended
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Sep. 30, 2014 Institution | Sep. 30, 2013 | Sep. 30, 2012 | Nov. 28, 2014 Subsequent Event [Member] Patents | Sep. 30, 2014 Assets acquired under capital leases [Member] | Sep. 30, 2013 Assets acquired under capital leases [Member] | Sep. 30, 2012 Assets acquired under capital leases [Member] | Sep. 30, 2014 Software and Software Development Costs [Member] | Sep. 30, 2013 Software and Software Development Costs [Member] | Sep. 30, 2012 Software and Software Development Costs [Member] | Sep. 30, 2014 Maximum [Member] | Sep. 30, 2014 Minimum [Member]
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of patents granted |  |  |  | 20 |  |  |  |  |  |  |  |
Number of patent applications pending |  |  |  | 23 |  |  |  |  |  |  |  |
Number of financial institutions signed agreements to deploy Mobile Deposit | 3,026 |  |  |  |  |  |  |  |  |  |  |
Number of companies deployed Mobile Deposit | 2,521 |  |  |  |  |  |  |  |  |  |  |
Number of U.S. retail banks and payment processing companies | 50 |  |  |  |  |  |  |  |  |  |  |
Short term investments maturity period | Three months or less |  |  |  |  |  |  |  |  |  |  |
Investments maturity or sale is expected | 1 year |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |
Deferred software maintenance fees amortization period | 1 year |  |  |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  |  |  |  |  |  | 5 | 3
Depreciation and amortization of property and equipment total | 470,697 | 323,383 | 140,146 |  |  |  |  |  |  |  |  |
Fixed assets acquired under capital leases | 2,385,390 | 2,257,895 |  |  | 95,388 | 95,388 |  |  |  |  |  |
Depreciation expense under capital lease |  |  |  |  | 19,078 | 19,078 | 17,488 |  |  |  |  |
Accumulated depreciation | 1,092,120 | 628,231 |  |  | 55,644 | 36,566 |  |  |  |  |  |
Total repairs and maintenance expenses | 115,792 | 97,532 | 57,815 |  |  |  |  |  |  |  |  |
Impairment charges | 0 | 0 | 0 |  |  |  |  |  |  |  |  |
Software development costs capitalized | 0 | 0 |  |  |  |  |  |  |  |  |  |
Amortization of software development costs |  |  |  |  |  |  |  | 0 | 0 | 91,438 |  |
Tax benefit is measured based on the largest benefit | Greater than 50% |  |  |  |  |  |  |  |  |  |  |
Advertising costs | 99,670 | 123,905 | 72,053 |  |  |  |  |  |  |  |  |
Accumulated other comprehensive gain (loss) | $ (7,810) | $ 1,838 |  |  |  |  |  |  |  |  |  |

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